feat(schematic): reposition and auto-place Ref/Value field labels

Adds field-placement tools:
- set_schematic_property_position / batch_set_schematic_property_positions:
  move a symbol's Reference/Value field labels
- autoplace_schematic_fields: place every symbol's fields clear of its body
  and nearby net labels (the #1 readability problem in generated schematics)
- check_schematic_layout: audit out-of-bounds / fields-in-body / duplicate
  labels (note: overlaps upstream find_overlapping_elements etc. — reuse or
  drop on request)

Generic .kicad_sch text helpers are factored into commands/schematic_text_utils.py
so the batch/hierarchy modules don't import from one another.

- python/commands/schematic_text_utils.py: shared text/S-expr helpers
- python/commands/schematic_field_layout.py: SchematicFieldLayoutCommands
- src/tools/schematic-layout.ts + registry 'schematic_layout' category
- python/kicad_interface.py: import + instantiate + dispatch routes
- tests/test_schematic_field_layout.py: 23 unit tests incl. end-to-end on real .kicad_sch

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

python/kicad_interface.py

@@ -326,6 +326,7 @@ try:
     from commands.routing import RoutingCommands
     from commands.schematic import SchematicManager
     from commands.schematic_hierarchy import SchematicHierarchyCommands
+    from commands.schematic_field_layout import SchematicFieldLayoutCommands
     from commands.symbol_creator import SymbolCreator
     from commands.symbol_pins import SymbolPinCommands
 
@@ -450,6 +451,8 @@ class KiCADInterface:
         self.symbol_pin_commands = SymbolPinCommands()
         # Schematic hierarchy commands (insert sheets, scaffold sub-sheets)
         self.hierarchy_commands = SchematicHierarchyCommands(self)
+        # Schematic field placement / layout-check commands
+        self.field_layout_commands = SchematicFieldLayoutCommands()
 
         # Initialize JLCPCB API integration
         self.jlcpcb_client = JLCPCBClient()  # Official API (requires auth)
@@ -540,6 +543,10 @@ class KiCADInterface:
             # Schematic hierarchy commands (sheet insertion + subsheet scaffolding)
             "add_hierarchical_sheet": self.hierarchy_commands.add_hierarchical_sheet,
             "create_hierarchical_subsheet": self.hierarchy_commands.create_hierarchical_subsheet,
+            # Schematic field placement commands
+            "set_schematic_property_position": self.field_layout_commands.set_schematic_property_position,
+            "batch_set_schematic_property_positions": self.field_layout_commands.batch_set_schematic_property_positions,
+            "autoplace_schematic_fields": self.field_layout_commands.autoplace_schematic_fields,
             # JLCPCB API commands (complete parts catalog via API)
             "download_jlcpcb_database": self._handle_download_jlcpcb_database,
             "search_jlcpcb_parts": self._handle_search_jlcpcb_parts,